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2 OCR (Oxford Cambridge and RSA) is a leading UK awarding body, providing a wide range of qualifications to meet the needs of candidates of all ages and abilities. OCR qualifications include AS/A Levels, Diplomas, GCSEs, Cambridge Nationals, Cambridge Technicals, Functional Skills, Key Skills, Entry Level qualifications, NVQs and vocational qualifications in areas such as IT, business, languages, teaching/training, administration and secretarial skills. It is also responsible for developing new specifications to meet national requirements and the needs of students and teachers. OCR is a not-for-profit organisation; any surplus made is invested back into the establishment to help towards the development of qualifications and support, which keep pace with the changing needs of today s society. This mark scheme is published as an aid to teachers and students, to indicate the requirements of the examination. It shows the basis on which marks were awarded by examiners. It does not indicate the details of the discussions which took place at an examiners meeting before marking commenced. All examiners are instructed that alternative correct answers and unexpected approaches in candidates scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes should be read in conjunction with the published question papers and the report on the examination. OCR will not enter into any discussion or correspondence in connection with this mark scheme. OCR 2017

6 (risk of ) scar tissue (around stent) ; 1 max transplant risk of rejection ; long waiting list / shortage of (suitable) donors ; 1 max Total 21 Question Answer Marks Guidance 2 a i 18 year old male with Down syndrome (DS) 1. short(er) (compared to adult male without DS) ; 3 max IGNORE reference to any age under 18 ACCEPT ora throughout 2. correct use of comparative data (18 years) to support mp 1 ; 3. more, have high(er) weight/are fat(ter) AND more, have low(er) weight/ are thin(ner) ; e.g. (50 th centile) height for normal 18 year old is 175(cm) and for Down Syndrome 18 year old is 152(cm). 4. more between kg ; 5. more between 40-50kg ; ACCEPT any value within the ranges for mp 3 and 4 6

7 b ii 5.43 / 5.4 ; ; cm yr -1 ; Error: Absolute growth rate is a better measure, (Should read) relative (growth rate) / ( absolute growth rate is a ) worse measure ; 3 CREDIT any correct number of decimal places. 4 ONE mark for: OR 37.5 ACCEPT year for yr Error: Cells differentiate and are organised into organs which are grouped into tissues, (Should read ) organised into tissues which are grouped into organs ; ACCEPT organised into organs which are grouped into organs systems. Error: The lymphatic system grows fastest during first five years of life, (Should read) The nervous system (grows fastest)/ (grows fastest) between 8-12 years ; ACCEPT any value within this range Error: called the thymus where B lymphocytes mature, (Should read) where T lymphocytes (mature) ; 7